Quadrajet question. NEED answer asap.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lyrikz · 08-13-2008, 03:44 PM

Anyone know the size of the fuel line nut that goes into the side of the carburetor???? Im thinking its 1/2 or 3/8.

Im doing a fuel line from my mechanical pump to the carb, and i dont know the size on the carb. Carb is not here and just want to get this stuff here so i can just bolt the carb on and attach lines when it shows up....

66skylarkpost · 08-13-2008, 03:53 PM

the fuel line is 3/8 yet the retaining nut is 5/8 . the filter housing takes a 1 inch wrench , be sure to hold it solid when you loosen the fuel line to avoid twisting the line and its best to have a 5/8 flare or line wrench not to round it off , then its vise grip time . lol

68gmsee · 08-13-2008, 04:05 PM

Unless you're in a hurry, I might suggest waiting until you have the carb in hand and do the flairing and fitting then.

However, if you do have a need to do it now, I have a 1977 quadrajet in my garage with the filter and fuel inlet fitting in it. The inside diameter of the female opening where the line from the fuel pump would attach is 1/2 inch.

My assumption is that all quadrajets are the same size, but I may be wrong. You could get an adapter if you make one and it doesn't match.

Sorry... that's wrong. The 1/2" inside diameter is for the male fitting that goes into the female filter retainer on the side of the carb... Mine just had a short male plug in it.

d10s69c10 · 08-13-2008, 04:09 PM

^ agrees^

Oh when you get to that filter, Your going to want to remove it along with the spring and throw it into your neighbors back yard.

get a inline fuel filter.

lyrikz · 08-13-2008, 04:15 PM

Quote:

Originally Posted by 66skylarkpost

the fuel line is 3/8 yet the retaining nut is 5/8 . the filter housing takes a 1 inch wrench , be sure to hold it solid when you loosen the fuel line to avoid twisting the line and its best to have a 5/8 flare or line wrench not to round it off , then its vise grip time . lol

Ok, so the nut that is on the end of the fuel line that screws into the carb. is 5/8's??? And the fuel line itself is 3/8ths??

Quote:

Originally Posted by d10s69c10

^ agrees^

Oh when you get to that filter, Your going to want to remove it along with the spring and throw it into your neighbors back yard.

get a inline fuel filter.

Ya, under that big nut is a baby filter... I replaced that already, or am having that done.. I just need to know what size that nut is thats on the end of the fuel line that screws into the carb to keep the line in place.....

thanks for the quick responses.

d10s69c10 · 08-13-2008, 04:20 PM

its 5/8s i just went out and checked it personally.
the fuel line i could only assume is 3/8 inside diameter. dont got a tape on me but my eye dont usually lie.

lyrikz · 08-13-2008, 04:23 PM

Quote:

Originally Posted by d10s69c10

its 5/8s i just went out and checked it personally.
the fuel line i could only assume is 3/8 inside diameter. dont got a tape on me but my eye dont usually lie.

ok, line is 3/8ths, the fittion on the end of the line is 5/8ths that screws into the carb.

AWESOME....

lyrikz · 08-13-2008, 04:36 PM

Quote:

Originally Posted by d10s69c10

its 5/8s i just went out and checked it personally.
the fuel line i could only assume is 3/8 inside diameter. dont got a tape on me but my eye dont usually lie.

So the wrench is 5/8s????? I told the guy at the store 5/8ths and he said no way.....

lyrikz · 08-13-2008, 04:50 PM

Quote:

Originally Posted by 66skylarkpost

the fuel line is 3/8 yet the retaining nut is 5/8 . the filter housing takes a 1 inch wrench , be sure to hold it solid when you loosen the fuel line to avoid twisting the line and its best to have a 5/8 flare or line wrench not to round it off , then its vise grip time . lol

THat retaining nut is 5/8ths, but what size are those threads???? I guess thats what he is wanting to know.

08-13-2008, 03:44 PM	#1
lyrikz PITbut Join Date: Sep 2007 Location: monroe washington Posts: 3,052	Quadrajet question. NEED answer asap.... Anyone know the size of the fuel line nut that goes into the side of the carburetor???? Im thinking its 1/2 or 3/8. Im doing a fuel line from my mechanical pump to the carb, and i dont know the size on the carb. Carb is not here and just want to get this stuff here so i can just bolt the carb on and attach lines when it shows up....

08-13-2008, 03:53 PM	#2
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: Quadrajet question. NEED answer asap.... the fuel line is 3/8 yet the retaining nut is 5/8 . the filter housing takes a 1 inch wrench , be sure to hold it solid when you loosen the fuel line to avoid twisting the line and its best to have a 5/8 flare or line wrench not to round it off , then its vise grip time . lol __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car

08-13-2008, 04:05 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Quadrajet question. NEED answer asap.... Unless you're in a hurry, I might suggest waiting until you have the carb in hand and do the flairing and fitting then. However, if you do have a need to do it now, I have a 1977 quadrajet in my garage with the filter and fuel inlet fitting in it. The inside diameter of the female opening where the line from the fuel pump would attach is 1/2 inch. My assumption is that all quadrajets are the same size, but I may be wrong. You could get an adapter if you make one and it doesn't match. Sorry... that's wrong. The 1/2" inside diameter is for the male fitting that goes into the female filter retainer on the side of the carb... Mine just had a short male plug in it. Last edited by 68gmsee; 08-13-2008 at 04:09 PM.

08-13-2008, 04:09 PM	#4
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: Quadrajet question. NEED answer asap.... ^ agrees^ Oh when you get to that filter, Your going to want to remove it along with the spring and throw it into your neighbors back yard. get a inline fuel filter. __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid"

08-13-2008, 04:20 PM	#6
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: Quadrajet question. NEED answer asap.... its 5/8s i just went out and checked it personally. the fuel line i could only assume is 3/8 inside diameter. dont got a tape on me but my eye dont usually lie. __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid" Last edited by d10s69c10; 08-13-2008 at 04:22 PM.



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